Solution:1

0xF == 15. It's simply hexadecimal notation.

However, that snippet is not actually creating a GUID, it's just stringing a bunch of random integers together. It's not possible to create a GUID in JavaScript, because generating one requires parameters that the VM can't access (network address, etc).

Solution:2

0xF is hex notation

EDIT:

It looks like it's picking a random character 0-9 A-F 32 times

Solution:3

All it's doing is creating random number s and converting them to hex.

I just did a little investigating . . . it is taking a random number, multiplying it by 15 (0xF == 15) and then converting it to hex . . . the toString argument takes a radix. That's the same as saying 0xF.toString(10). That'll convert 0xF to decimal and return "15."

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